- Electromagnetic.
- Gravitational.
- Nuclear.
- Weak.
Explanation:
The force of viscosity arises from molecular Interaction between different layers of fluids that are In motion. Molecular forces are electromagnetic in nature. Therefore, viscosity must also be electromagnetic.
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The capacity of parallel plate condenser depends on
|
(a) The type of metal used |
(b) The thickness of plates |
|
(c) The potential applied across the plates |
(d) The separation between the plates |
A stream of electrons is projected horizontally to the right. A straight conductor carrying a current is supported parallel to electron stream and above it. If the current in the conductor is from left to right then what will be the effect on electron stream
|
(a) The electron stream will be pulled upward |
|
(b) The electron stream will be pulled downward |
|
(c) The electron stream will be retarted |
|
(d) The electron beam will be speeded up towards the right |
The wrong statement about electric lines of force is
|
(a) These originate from positive charge and end on negative charge |
|
(b) They do not intersect each other at a point |
|
(c) They have the same form for a point charge and a sphere |
|
(d) They have physical existence |
Two identical magnetic dipoles of magnetic moments 1.0 A-m2 each, placed at a separation of 2m with their axis perpendicular to each other. The resultant magnetic field at a point midway between the dipoles is
|
(a) 5 |
(b) |
(c) |
(d) None of these |

A dielectric slab of thickness d is inserted in a parallel plate capacitor whose negative plate is at x = 0 and positive plate is at x = 3d. The slab is equidistant from the plates. The capacitor is given some charge. As one goes from 0 to 3d
|
(a) The magnitude of the electric field remains the same |
|
(b) The direction of the electric field remains the same |
|
(c) The electric potential increases continuously |
|
(d) b, c |
In a transformer, the number of turns in primary and secondary are 500 and 2000 respectively. If current in primary is 48 A, the current in the secondary is
|
(a) 12 A |
(b) 24 A |
(c) 48 A |
(d) 144 A |